Nest CLI

This is a collection of commands written in Ruby to install, update, and generally administer the Nest distribution.

1. Installation
2. Usage
   • Boot Environments
   • Exec
   • Install
   • Update
   • Reset
3. Development

Installation

Puppet ensures the latest app-admin/nest-cli package from the Nest overlay is installed.

Usage

All commands provided by this program can be accessed by running nest. There are subcommands to manage ZFS boot environments, install new hosts, update existing hosts, and reset them back to the desired state.

Commands	Description
nest beadm SUBCOMMAND	Manage ZFS boot environments
nest exec NAME	Run a command in a Nest image
nest install NAME	Install a new host
nest update	Update hosts and images

Boot Environments

nest beadm provides subcommands to create, destroy, mount, unmount, activate, and query ZFS boot environments, which are clones of the OS filesystems inspired by the same concept in Solaris 11. Boot environments are used by the Nest installer to perform A/B seamless system updates similar to Android.

Commands	Description
nest beadm activate [NAME]	Configure and enable a boot environment for mounting at boot
nest beadm create NAME	Clone the current boot environment to a new one
nest beadm destroy NAME	Delete the specified boot environment
nest beadm list	Print the names of all boot environments
nest beadm mount NAME	Mount a boot environment under /mnt
nest beadm unmount NAME	Unmount a boot environment under /mnt
nest beadm status	Display the current and active boot environments

All of these commands accept a --dry-run argument to only print the changes that would be made.

Exec

nest exec launches a command or shell (tmux session) inside of a Nest image using either Podman or systemd-nspawn as appropriate. It provides a uniform interface for getting into boot environments, root disks mounted under /mnt, host images from /nest/hosts, and Nest container images, regardless of architecture. It maps in useful host data, such as Portage, by default.

Options	Description
-b, --boot-env	The specified NAME is a boot environment
-m, --mnt	The specified NAME is a root mounted under /mnt
-h, --host	The specified NAME is a host image under /nest/hosts
-i, --image	The specified NAME is a Nest container image (e.g. stage1)
-c, --command=CMD	Run CMD instead of launching an interactive shell
-e, --extra-args=ARGS	Pass ARGS to the underlying runtime system
-p, --puppet	Map host's Puppet configuration into container
-H, --no-home	Do not map homes from the host into the container
-N, --no-nest	Do not map /nest into the container
-P, --no-portage	Do not map Portage data into the container
-S, --no-ssh	Do not map ssh-agent socket into the container
-X, --no-x11	Do not allow access to the host's X server
-O, --no-overlay	Write changes to the underlying image (no-op for boot environments and container images)
-q, --quiet	Hide most output (except output produced by the command or shell)
--debug	Show debug messages (there isn't any meaningful debug output yet)
--dry-run	Only print actions that would modify the system

When the image type (-b, -m, -h, -i) isn't specified, they are tried in that order.

Install

nest install is the Nest installer for hosts with a Stage 3 image. It understands everything from partitioning to firmware installation and provides reasonable fault tolerance.

Options	Description
--clean	Just run the cleanup step
-b DISK, --boot=DISK	Optional boot disk to use. Enables whole disk zpool support.
-d DISK, --disk=DISK	The disk to format and install on (e.g. /dev/sda or /tmp/boot.iso)
-e, --encrypt	Use ZFS encryption
--force	Run cleanup actions (like umount) to try to correct unexpected system states
-s STEP, --step=STEP	Only run this installation step
--begin=STEP	The first installation step to run (default: partition)
--end=STEP	The last installation step to run (default: firmware)
--ashift=SIZE	Set the zpool ashift value (default: 9)
--debug	Print additional information, such as the input provided to commands
--dry-run	Only print actions that would modify the system

The steps are self explanatory and, unless specified with --step, --begin, or --end options, run in the following order:

1. partition
2. format
3. mount
4. copy
5. bootloader
6. unmount
7. firmware
8. cleanup (not run by default)

Update

nest update performs a traditional package-based update with backups and configuration management.

Options	Description
-b, --boot-env	Update the alternate boot environment
-d DIR, --dir=DIR	Update the image mounted at DIR
-e ARGS, --extra-args=ARGS	Pass ARGS to the emerge update command
-r, --resume	Skip the backup step
-s STEP, --step=STEP	Only run this update step
--begin=STEP	The first update step to run (default: backup)
--end=STEP	The last update step to run (default: activate)
-n, --noop	Run Puppet and Portage commands in no-op mode
-v, --verbose	Run Portage commands with extra verbosity
-q, --quiet	Hide most output (except output produced by the command or shell)
--debug	Print additional information, such as the input provided to commands
--dry-run	Only print actions that would modify the system

The steps are self explanatory and, unless specified with --step, --begin, or --end options, run in the following order:

1. backup
2. mount
3. config
4. pre (if /etc/nest/pre-update.sh exists)
5. packages
6. post (if /etc/nest/post-update.sh exists)
7. reconfig
8. unmount
9. activate

Reset

nest reset resets this host from its Stage 3 image.

Options	Description
-k, --kernel	Just update the kernel
-f, --firmware	Just update the firmware
-r, --resume	Skip the backup step
-s STEP, --step=STEP	Only run this update step
--begin=STEP	The first update step to run (default: backup)
--end=STEP	The last update step to run (default: activate)
-n, --noop	Run Puppet and Portage commands in no-op mode
-v, --verbose	Run Portage commands with extra verbosity
-q, --quiet	Hide most output (except output produced by the command or shell)
--debug	Print additional information, such as the input provided to commands
--dry-run	Only print actions that would modify the system
-t, --test	Test rsync with checksums instead of times

The steps are self explanatory and, unless specified with --step, --begin, or --end options, run in the following order:

1. backup
2. mount
3. sync
4. kernel
5. unmount
6. activate
7. firmware (not run by default)

Development

This program is developed with Bundler. Initialize the project with bundle install, then make changes to code under the lib directory. Check the code with bundle exec rake and run the CLI with bundle exec bin/nest.

Prepare for release by bumping VERSION in lib/nest/version.rb and create a new Git tag followed by a new GitLab release.